黄磷尾气中磷单质的间接测定法

提出了一种间接测定黄磷尾气中磷单质的方法——磷单质质量浓度等于总磷质量浓度减去磷化氢和五氧化二磷的质量浓度。尾气中总磷的测定采用喹钼柠酮容量法,五氧化二磷的测定采用抗坏血酸还原-钼蓝分光光度法,磷化氢的测定采用火焰光度气相色谱法。结果表明,总磷测定方法的加标回收率为98.33%-101.24%,测定结果的相对标准偏差（RSD）为0.29%;五氧化二磷测定方法的加标回收率为96.81%-101.21%,测定结果的RSD为0.87%。尾气中总磷的质量浓度为1 038.384 4 mg/m3,五氧化二磷和磷化氢的质量浓度分别为0.022 1 mg/m3和686.1 mg/m3,因此,尾气中单质磷的质量浓度为352.262 3 mg/m3。

海水养殖真鲷最小弧菌外毒素的免疫学特性初步研究

按常规方法免疫健康家兔进行外毒素抗体的制备。将制备的兔抗血清与等体积的外毒素混合,37℃下作用1h后,观察毒素的溶血性及细胞毒性,取免疫前家兔血清(零号血清)作阴性对照,用毒素作阳性对照。结果表明,兔抗毒素血清能中和毒素,抑制毒素对人血细胞的溶血性及对Vero细胞的细胞毒性,中和毒素的兔抗毒素血清最高稀释度为1∶256,毒素对照显示出溶血性及细胞毒性。毒素与一定浓度的嗜水气单胞菌HEC毒素抗血清、霍乱肠毒素抗血清在37℃下分别作用1 h后,观察其溶血性及细胞毒性。结果表明,这2种抗血清都不能中和毒素,毒素与这2种抗血清作用后,仍然保持其溶血性及细胞毒性。用浓度为0.2%的福尔马林对浓度为5mg/mL的外毒素进行灭活处理,得到的灭活疫苗为毒素苗。一定稀释度的毒素苗,在初次免疫真鲷2周后利用病原菌对免疫组及对照组的实验鱼进行人工攻毒感染,毒素苗的免疫保护率可达80%,强化免疫后,免疫保护率有所提高。注射免疫的免疫保护率比浸泡免疫的高。

Does the Availability of Community Health Worker/Mobile-Health Van Unit within the Community Impacts Neonatal Survival?

This study uses the data from the National Family Health Survey round-2. Using hierarchical linear models the role of community level variables in predicting neonatal deaths at individual level is analyzed. SAS sub-routine PROC GLIMMIX is used for hierarchical linear modeling. Findings re-enforce the importance of mother’s literacy and tetanus toxid vaccination during pregnancy in predicting neonatal deaths at individual level. At community level, though the magnitude of the presence of either a private doctor, or a visiting doctor, or a village guide, or a traditional health attendant, or the presence of mobile health van unit within community is in an expected direction, the effect is statistically not significant. In order to capture true impact of community level intervention of program success it is imperative that the large demographic surveys should incorporate more and more community level indicators while designing these surveys.

4种杀虫剂对马尾松毛虫的作用及毒力

本研究选用印楝素、川楝素、灭幼脲Ⅲ号和溴氰菊酯等杀虫剂点滴处理马尾松毛虫幼虫和卵。印楝素、灭幼脲Ⅲ号、溴氰菊酯的触杀ＬＤ＿（５０）分别为２．５９９０，１．７５００和０．００１２μｇ／头。印楝素、灭幼脲Ⅲ号和川楝素均能抑制试虫生长发育，在４．０μｇ／头剂量下，总抑制率分别为８０．０％，７０．０％和４７．５％。印楝素和灭幼脲Ⅲ号还表现杀卵作用活性，２００ｍｇ／ｋｇ印楝素处理１，４和７日龄卵其校正死亡率在７６．６％以上；２００ｍｇ／ｋｇ灭幼脲Ⅲ号则可达９０．０％以上。试验中还观察记录了试虫受药后的症状反应情况。